On 8/2/2011 10:44 PM, Alexander Quest wrote:
Hi guys- I'm having a problem with a list that has nested tuples:
attributes = [("strength", 0), ("health ", 0), ("wisdom ", 0),
("dexterity", 0)]
I've defined the list above with 4 items, each starting with a value
of 0. The player
enters how many points he or she wants to add to a given item. The
selection menu
is 1 - strength; 2 - health; 3 - wisdom; 4- dexterity. So the
"selection" variable is actually
1 more than the index location of the intended item. So I have the
following code:
print("Added ", points, "to ", attributes[selection-1][0], "attribute.")
My intent with this is to say that I've added this many points
(however many) to the
corresponding item in the list. So if the player selects "1", then
selection = 1, but I subtract
1 from that (selection -1) to get the index value of that item in the
list (in this case 0). Then I
have [0] to indicate that I want to go to the second value within that
first item, which is the
point value. I get an error saying that list indices must be integers,
not strings. I get a similar
error even if I just put attributes[selection][0] without the minus 1.
Also, it seems that the tuple within the list cannot be modified
directly, so I can't add points to the original value of "0" that all
4 items start with. Is there a way to keep this nested list with
tuples but be able to modify the point count for each item, or will it
be better to create a dictionary or 2 separate lists (1 for the names
"Strength, Health, Wisdom, Dexterity" and one
for their starting values "0,0,0,0")? Any suggestions/help will be
greatly appreciated!!!
Thanks for inquiring. Some guidelines about questions:
1 - show us more code. in this case specifically how you obtain user input.
2 - show the complete traceback
What does the error message tell you? Why would selection be a string
rather than an integer? This has to do with how you obtain selection
from the user. What
Why did you expect to be able to alter the value of a tuple element?
Tuples are immutable! Use a list instead.
HTH
--
Bob Gailer
919-636-4239
Chapel Hill NC
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